/*
 * Copyright 2012 Gregor Schauer
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package at.schauer.gregor.vienna.validator;

import org.apache.commons.lang3.reflect.MethodUtils;

import javax.validation.ValidationException;

/**
 * @author Gregor Schauer
 */
public class RangeValidator<N extends Number> implements Validator<N> {
	private N min;
	private N max;

	public RangeValidator(N min, N max) {
		this.min = min;
		this.max = max;
	}

	@Override
	public N validateObject(N obj) {
		return validate(obj);
	}

	@Override
	@SuppressWarnings("unchecked")
	public String validateString(String obj) {
		try {
			return validate((N) MethodUtils.invokeExactStaticMethod(min.getClass(), "valueOf", obj)).toString();
		} catch (Exception e) {
			throw new ValidationException(e);
		}
	}

	protected N validate(N obj) {
		return obj.doubleValue() < min.doubleValue() ? min : obj.doubleValue() > max.doubleValue() ? max : obj;
	}
}
